Expansion joint for concrete pipe



May s, 1928.

. F. H. SHERRERD EXPANSION JOINT FOR CONCRETE PIPE Filed June 18. 1926hwmw w INVEN TOR. fizm'z'ylflararal,

BY j am ATTORNEYS.

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Patented May 8, 1928.

UNITED STATES .PATENT OFFICE.

FRANCIS K. SHERRERD, OF EAST ORAN GE, NEW JERSEY, ASSIGNOR TO N EWARKCON- CRETE PIPE 00., O1 NEWARK, NEW JERSEY, A CORPORATION OF NEW JERSEY.

EXPANSION JOIN!!! FOR CONCRETE PIPE.

Application filed lime 18, 1926. Serial No. 118,910.

This invention relates, generally, to an improved expansion joint forconcrete pipe or conduit.

It is the object of this invention to provide in connectionwithreenforced concrete pipe of the bell and spigot type, a novelconstruction of leak-proof expansion joint The present invention isillustrated in the accompanying drawings, in which Figure 1 is afragmentary longitudinal section through the abutting or adjoined endsof adjacent pipe sections equipped with the novel leak-proof expansionjoint made according to and embodying the principles of this invention.

Figure 2 is a similar longitudinal section of adjacent ipe sections searated one from the ogher, t e extensible element being remove Figure 3is a fragmentary transverse sec tional view of the extensible element ofthe novel joint structure drawn on an enlarged scale; and Figure 4 is asimilar fra entary transverse sectional view of a pa ng element used inconnection with the novel joint structure.

Similar characters of reference are employed in all of the hereinabovedescribed views, to indicate corresponding parts.

In the drawings, the reference character 5 indicatesadjacent ipe orconduit sections made of concrete, t e same being suitably reenforced byannular and longitudinal reenforcingmetallic elements 6; or if desired,and particularly in connection with concrete pipe ada ted. for highpressure work, tubular metallic shells or cores may be imbedded in theconcrete walls of the pipe or conduit, all, in the manner already wellknown and familiar to those skilled in the art to which this inventionrefers.

In the embodiment of myinvention, as shown in the accompanying drawings,each pipe or conduit section is provided at one cally into thebell-portion of an adjacent pipe conduit section. 7

Imbedded in the bell end of the pipe or conduit section 4 is an, annularcast-iron or steel shell or collar 9, the interior end of which isimbedded inthe pipe or conduit body and suitably connected with thereenforcing elements 6 as at 10, or with the reenforcing tubularmetallic cores when such are employed, all in any convenient or suitablemanner familiar to those skilled in the art. The exterior end of theannular shell or collar 9 projects into the mouth of the bell-portion 7so as to line the same, but terminates short of the outer end of saidbell-portion 7 so as to provide a free ortion of the latter, theinternal side of w ich is outwardly flared or inclined, as at 11, fromthe outer end of said shell or collar 9 toward the extremity of saidbell-portion 7.

Imbedded in the spigot end of the pipe or conduit section 4 is anannular cast-iron or steel shell or collar 12, the interior end of whichis imbedded in the pipe or conduit body and also suitably connected withthe reenforcing elements 6, as at 13, or with the reenforcing tubularmetallic cores when such are employed, all in any convenient or suitablemanner familiar tov those skilled in thelart. The exterior end of saidshell or collar. 12 projects freely beyond the igot end of the pipe orconduit section, an the same is tapered toward its free end tocorrespond to and fit the flared mouth 11 of the bell end of an adjacentipe section when oppasied and adjoined to iihe latter.

on two pi e or conduit sections are joined together, y interconnectingopposed bell andspigot ends'thereof, the outer extremities'of theannular shells or collars 9 and 12 will be brought into abuttingrelation one with the other, as shown in Figure 1 of the drawings. 7

The shell or collar 9 of one pipe end is royided at its interior side,ad acent to its ree outer extremity, with an annular channel or groove14,'the outward side wall of which is undercut, as at 15. In like mannerthe shell or collar 12 of the opposed pipe end is likewise provided atits interior side, adjacent to its free outer extremity, with a similarannular channel or groove 16, the

The reference character 18 indicates an annular sheet metallic sealingelement, provided intermediate its sides with a yieldable fold or loop19, whereby said sealing element is extensible and contracta'ble in thedirection of the axis of the pipe or conduit. Integrally connected withthe respective side margins of said sealing element are annular anchorflanges 20 and 21. Said sealing element may be made of any suitablesheet metal, but is preferably made of lead, copper or similar noteasily corroded metal.

After the adjacent pipe sections are en gaged together by theinterconnection of their adjoining bell and spigot ends, and theextremities of the respective shells or collars 9 and 12 are abuttedtogether, said sealing element 18 is disposed over the jointintermediate said abutting extremities of the shells or collars 9 and12, with its anchor flanges 20 and 21 entered respectively in thechannels or grooves 14 and 16. Vhen the parts are thus assembledtogether a suitable packing gasket is calked into each channel or groove14 and 16, thereby not only bending the anchor flanges 20 and 21 of thesealing element 18 beneath the undercut sides 15 and 17 of saidrespective channels or grooves so as to lock said sealing element 18against displacement from operative assembled-relation, but also thusforming tight leak-proof joints intermediate said sealing element 18 andthe respective shells or collars 9 and 12. The said packing gaskets maybe variously made, preferably, however, the same consist in a tubularshell 22 of soft malleable metal, e. g. lead, provided with an internalfibrous core 23; such form of gasket being readily deformed in calkingto conform to the cross-sectional shape of the grooves or channels 14:and 16, while at the same time tending to retain the shape orconformation wrought therein by the tamping or calking operations.

The ends of the pipe or conduit sections within the collars or shellsare undercut, so that an internal recess is provided into which mortaror cement filling 24; is filled after the joint has been completed inthe manner above described.

As will be understood from the above description, and by an inspectionof Figure 1 of the drawings, the completed joint structure is not onlyleak-proof and ca able of withstanding considerable pressure, ut suchleak-proof qualities will not be disturbed by relative movement of theadjoining pipe ends due to expansion or contraction, settling or othercauses developed under conditions of use, since the yieldable fold orloop 19 of the anchored and calked sealing element 18 will by expansionor contraction permit such relative movements without risk of opening upthe joints.

It will also be understood that various modifications of the pipe and ofthe joint structure hereinabove described may be made without departingfrom the scope of my invention as set forth in the following claims.

I claim 1. A leak proof expansion joint for concrete pipes, comprisingmetallic collars imbedded respectively in the abutting ends of adjoiningpipe sections, the outer extremi ties of said collars being adapted toabut when said pipe sections are joined together, each collar having anannular groove adjacent to its outer extremity, an extensible metallicsealing element extending over the joint formed by the abuttingextremities of said collars, said scaling element having anchoring meansat opposite sides thereof engage-d respectively in the grooves of saidcollars, and packing means calked into said grooves to both secure andseal the connection of said sealing element anchoring means with saidcollars.

2. A leak-proof expansion joint for concrete pipes, comprising metalliccollars imbedded respectively in the abutting ends of adjoining pipesections, the outer extremities of said collars being adapted to abutwhen said pipe sections are joined together, said abutting ends of saidpipe sections being cut away to provide an annular recess in which theabutting extremities of said collars are exposed, each collar having anannular groove adjacent to its outer erremity opening into said recess,an extensible metallic sealing element extending over the joint formedby the abutting extremities of said collars, said sealing element havinanchoring means at opposite sides thereof engaged respectively in thegrooves of said collars, packing means calked into said grooves to 0thsecure and seal the connection of said anchoring means with saidcollars, and a cement filling in said recess over said sealing element.

3. A leak-proof expansion 'oint for concrete pipes, comprising metalliccollars imbedded respectively in the abutting ends of adjoining ,ipesections, the outer extremities of said co lars being adapted to abutwhen said pipe sections are joined together, each collar aving anannular groove adjacent to its outer open extremity, each said groovehaving an undercut outward side wall, an annular sheet metal sealingelement having a medial annular fold to render said elementlongitudinally expansible, said sealing element being further providedat its respective sides with annular anchor flanges respectively engagedin said oeves of said collars when said sealing e ement is disposed tocover the joint intermediate the abutting ends of said collars, andpacking means calked into said grooves to deform said which the abuttingextremities of said collars are exposed, each collar having an annulargroove adjacent to its outer open extremity, each said groove having anundercut outward side wall, an annular sheet metal sealingelement havinga medial annular fold to render said element longitudinall expansible,said sealing element being" furt or provided at its respective sideswith annular anchor flanges respectively engaged in said rooves of saidcollars when said sealing efiement is disposed to cover the'jointintermediate the abutting ends of said collars, packing means calkedinto said grooves to deform said anchor flanges beneath the undercutoutward sides of saidjgrooves to both secure and seal the operativeconnection of said sealing element with said collars, and a cementfilling in said recess over said sealing element.

5. A leakroof expansion joint for the abutting en s of ad oiningconcrete pipe sections, com rising metallic collars respectively imbeded in said pipe ends so as to abut together endwise, each collar havingan annular groove adjacent to its free end, an annular sheet metalmember havin a medial fold to render the same longitudinally expansibleand side flanges to respectively engage in the grooves of the respectiveabutting ends of said collars so that said sheet metal member covers thejoint intermediate the abutting ends of the latter, and packing elementscalked into said grooves against said flanges entered therein to bothsecure pipe sections are joined together, said and seal said metallicmember in interconnecting relation to and between said collars.

6. A leakroof expansion joint for the abutting en s of ad oiningconcrete pipe sections, comprising metallic collars respectively imbeded in said pi e ends so as-to abut together endwise, eac collar havin anannular groove adjacent to its free en an annular sheet metal memberhaving a medial fold to render the same longitudinally expansible andside flanges to respectively engage in the grooves of the respectiveabutting ends of said collars so that said sheet metal member covers thejoint intermediate the abutting ends of the latter, the outward sidewall of each collar groove being undercut, and a packing element calkedinto said grooves against said flanges to bend and seal the same a ainstand beneath said undercut side wal s of said collar grooves.

7. A leak-proof expansion joint for the abutting ends of adjoiningconcrete pipe sections, comprising metallic collars respectivelyimbedded in said pipe ends so as to abut together endwise, each collarhaving an annular groove adjacent to its free end, an annular sheet metamember having a medial fold to render the same longitudinally expansibleand side flanges to respectively engage in the grooves of the respectiveabutting ends of said collars so that said sheet metal member covers thejoint intermediate the abutting ends of the latter, the outward sidewall of each collar groove being undercut, and a packing element calkedinto said grooves against said flanges to bend and seal the same againstand beneath said undercut side walls of said collar grooves, saidpacking elements comprising substantially tubular 'metallic casin shaving a central core of fibrous materia In testimony, that I claim theinvention set forth above I have hereunto set my hand this 17th day ofJune 1926.

FRANCIS H. SHERRERD.

